Mojo Hand Iron Bell all the way. I get KILLER LEAD AND RHYTHM tones out of it. Also, it really plays well with boost pedals. I'll hit it with my Mojo Hand Rook if I want something extremely over the top and it responds in spades. Iron Bell all the way.

Some very good choices there. Here are my thoughts on the pedals I'm familiar with:

- Stomp Under Foot Ram's Head. Matt Pasquerella himself recommends that, if you want the Ram's Head sound to work better in a band situation, the Violet Menace is a better option. For myself, I really like the Hellephant, his take on a Fuzz Face circuit.

- EQD Hoof. I really like their Dream Crusher (sensing a theme here?). I've heard nothing but good things about the Hoof (and its sibling, the Cloven Hoof). It's a shame because the wife's giving me the hairy eyeball when it comes to my recent pedal purchases (I went kinda nuts this past year).

Thanks everyone, really great suggestions.
I just recently discovered SUF pedals while searching for Muff clones. If anyone has more to say re: these, please chime in.
Also, I'm playing a Fender DRRI, so if anyone has any specific advice for muff pedals for this amp, please let me know.
Looks like Iron Bell and SUF are the recs here.

Contact the dude at Make Sounds Loudly, he can get you exactly what you want and cheaper. I got a custom Russian style big muff from him, with about twice as much gain per my request. I have used all the big boys, from SUF to Wren and Cuff to the Musket and I dig the Make Sounds Loudly pedal more.

I was leaning toward this one, actually.
Is this pedal that tweakable? So russian muff and ram's head tones?

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Easily. It essentially has a three band EQ, so you can adjust exactly the tone you want. Scooped russian, mid-boosted Gilmour, you name it. As far as gain goes, for Rams head tones, keep the fuzz below noon and the pre above it. For smooth russian tones, switch those.

You should also consider Basic Audio. They make at least three Muff-ish fuzzes. I have the Foxey Lady and the Alter-destiny. They're both great, but the Alter-destiny is mu current favorite Muff-ish fuzz.

I have the Iron Bell and truly enjoy the various tones I can dial in. From my use, I find it strengths are much more towards lead tones. I am curious to the others who posted earlier in this thread what settings they used for more rhythm/chordal progressions.

The Iron Bell is a very clean sounding muff .. LoL .. super amounts of gain on tap but so articulate -- which is why it works a bit more for lead. The design is suppose to equate to a muff circuit in combination with a tube driver. I believe the 'Pre' knob on the BE Musket is to emulate the same effect but allows one to dial in/out the tube driver circuit.